UCLA Proxy Server

Before activating a proxy server in Opera, it is recommended that you clear your browsing history and cookies of sites. This is necessary to ensure that information about the computer is not transmitted during further connections. To do this, it is enough to follow the algorithm:

Open the browser.
Click on the opera icon in the upper left corner.
Hover your mouse cursor over the "History" item.
Use the option "Clear history of visits".
After that you need to specify parameters of the proxy server. To do this, perform the following actions:

Open your browser.
Click on the Opera icon in the top left corner.
Click on "Settings".
Select the "Advanced" option.
Scroll down to the "System" tab.
Click on "Open proxy settings for computer".
Click on "Network settings".
Activate the "Use a proxy server" option.
In the window that opens, specify the IP address of the proxy server. Enter the address in the field of the protocol to which the proxy server belongs. You can get this information from your provider.
Click "OK" to save your settings.

It seems there might be a confusion in your request. Polly is a resilience and transient-fault-handling library in C# for dealing with issues like network failures, timeouts, and other transient errors. It is not directly related to parsing courses or web scraping.

If you are looking to parse a course from a website using C#, you might want to use a combination of HTTP requests and HTML parsing libraries. Here's a basic example using the HtmlAgilityPack library for HTML parsing and HttpClient for making HTTP requests

Install HtmlAgilityPack:

You can install the HtmlAgilityPack library using NuGet Package Manager Console:

Install-Package HtmlAgilityPack

Example Code

Here's a simple example of how you might use HttpClient and HtmlAgilityPack to parse course information from a website:

using System;
using System.Net.Http;
using HtmlAgilityPack;

class Program
{
    static async System.Threading.Tasks.Task Main(string[] args)
    {
        // URL of the course page
        string courseUrl = "https://example.com/courses";

        // Make an HTTP request to get the HTML content
        using (HttpClient client = new HttpClient())
        {
            string htmlContent = await client.GetStringAsync(courseUrl);

            // Use HtmlAgilityPack to parse the HTML
            HtmlDocument doc = new HtmlDocument();
            doc.LoadHtml(htmlContent);

            // Extract course information (modify as per the HTML structure)
            HtmlNodeCollection courseNodes = doc.DocumentNode.SelectNodes("//div[@class='course']");
            if (courseNodes != null)
            {
                foreach (HtmlNode courseNode in courseNodes)
                {
                    string courseTitle = courseNode.SelectSingleNode(".//h2")?.InnerText.Trim();
                    string courseDescription = courseNode.SelectSingleNode(".//p")?.InnerText.Trim();

                    Console.WriteLine($"Title: {courseTitle}");
                    Console.WriteLine($"Description: {courseDescription}");
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("No course information found on the page.");
            }
        }
    }
}

This is a basic example, and you'll need to adapt it based on the actual HTML structure of the course page you are working with.

To move the mouse using Selenium with C#, you can use the IJavaScriptExecutor interface to execute JavaScript commands that control the mouse movements on the web page. Here's an example of how to move the mouse to a specific element:

using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Support.UI;
using System;

namespace SeleniumMouseMoveExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Set up the WebDriver
            IWebDriver driver = new ChromeDriver();
            driver.Manage().Window.Maximize();

            // Navigate to the target web page
            driver.Navigate().GoToUrl("https://www.example.com");

            // Wait for the page to load
            WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
            IWebElement element = wait.Until(x => x.Id == "target-element");

            // Move the mouse to the element
            ((IJavaScriptExecutor)driver).ExecuteScript(
                "arguments[0].scrollIntoView();", element);
            ((IJavaScriptExecutor)driver).ExecuteScript(
                "arguments[0].style.border='2px solid red';", element);
            ((IJavaScriptExecutor)driver).ExecuteScript(
                "window.getSelection().empty();", element);
            ((IJavaScriptExecutor)driver).ExecuteScript(
                "var event = document.createEvent('MouseEvents');" +
                "event.initMouseEvent('mousemove', true, false, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);" +
                "arguments[0].dispatchEvent(event);", element);

            // Perform any additional actions as needed

            // Close the browser
            driver.Quit();
        }
    }
}

In this example, we first set up the WebDriver and navigate to the target web page. We then use the WebDriverWait class to wait for a specific element to load on the page. After that, we use the IJavaScriptExecutor interface to execute JavaScript commands that move the mouse to the element.

The scrollIntoView() method scrolls the element into view, the style.border property is used to highlight the element, and the window.getSelection().empty() method clears any existing selection. Finally, we create a custom mouse event using the createEvent method and dispatch it to the element using the dispatchEvent method.

Remember to replace "https://www.example.com" and "target-element" with the actual URL and element ID or selector of the web page and element you want to interact with.

To add a proxy in ZennoPoster, follow these steps:

1. Open ZennoPoster and go to the "Settings" menu.

2. Select "Network settings" or "Proxy settings" depending on the version you are using.

3. Click on the "Add" button to create a new proxy profile.

4. Enter the proxy server address, port, and select the protocol (HTTP or HTTPS) from the drop-down menu.

5. If your proxy requires authentication, enter the username and password in the respective fields.

6. Click "Save" to add the proxy profile.

7. To use the proxy, select it from the list of available proxies in the "Proxies" section of your task settings.

You can check it with the ping command from the command line in Windows. It is enough to enter it, with a space - the data of the proxy server (including the number of the port used) and press Enter. The reply message will tell you whether or not you have received a reply from the remote server. If not, the proxy is unavailable, respectively.